Dalmatia is today a historical region only, not formally instituted in Croatian law. Its exact extent is therefore uncertain and subject to public perception. According to Lena Mirošević and Josip Faričić of the University of Zadar:[6]

..the modern perception of Dalmatia is mainly based on the territorial extent of the Austrian Kingdom of Dalmatia, with the exception of Rab island, which is geographically related to the Kvarner area and functionally to the Littoral-Gorski Kotar area, and with the exception of the Bay of Kotor, which was annexed to another state (Montenegro) after World War I. Simultaneously, the southern part of Lika and upper Pounje, which were not a part of Austrian Dalmatia, became a part of Zadar County. From the present-day administrative and territorial point of view, Dalmatia comprises the four Croatian littoral counties with seats in Zadar, Šibenik, Split, and Dubrovnik.

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"Dalmatia" is therefore generally perceived to extend approximately to the borders of the Austrian Kingdom of Dalmatia. However, due to territorial and administrative changes over the past century, the perception can be seen to have altered somewhat with regard to certain areas, and sources conflict as to their being part of the region in modern times:

The island of Rab, along with the small islands of Sveti Grgur and Goli, were a part of the Kingdom of Dalmatia and are historically and culturally related to the region, but are today associated more with the Croatian Littoral, due to geographical vicinity and administrative expediency.

Gračac Municipality and northern Pag. A number of sources express the view that "from the modern-day administrative point of view", the extent of Dalmatia equates to the four southernmost counties of Croatia: Zadar, Šibenik-Knin, Split-Dalmatia, and Dubrovnik-Neretva.[6][11][12][13][14][15] This definition does not include the Bay of Kotor, nor the islands of Rab, Sveti Grgur, and Goli. It also excludes the northern part of the island of Pag, which is part of the Lika-Senj County. However, it includes the Gračac Municipality in Zadar County, which was not a part of the Kingdom of Dalmatia and is not traditionally associated with the region (but instead the region of Lika).

The inhabitants of Dalmatia are culturally subdivided into two or three groups. The urban families of the coastal cities, sometimes known as Fetivi,[16] are culturally akin to the inhabitants of the Dalmatian islands (known derogatorily as Boduli). The two are together distinct, in the Mediterranean aspects of their culture, from the more numerous inhabitants of the Zagora, the hinterland, referred to (sometimes derogatorily) as the Vlaji.[16] The latter are historically more influenced by Ottomanculture, merging almost seamlessly at the border with the Herzegovinian Croats and southern Bosnia and Herzegovina in general.

The former two groups (inhabitants of the islands and the cities) historically included many Venetian and Italian speakers, many of whom identified as Italians (esp. after the Unification of Italy). Their presence, relative to those identifying as South Slavs, decreased dramatically over the course of the 19th and the first half of the 20th century. There remains, however, a strong cultural, and, in part, ancestral heritage among the natives of the cities and islands, who today almost exclusively identify as Croats, but retain a sense of regional identity.

The issue is today a politically polarizing one, as the right-wing Croatian Democratic Union party, which held power for most of the post-Yugoslav period, generally favored the designation of "Littoral Croatia" over a Dalmatian regional identity. A rough political divide separates the natives of the cities and islands from those of the hinterland, with the former leaning towards the left, and the latter to the right of the political spectrum.

Most of the area is covered by Dinaric Alps mountain ranges running from north-west to south-east. On the coasts the climate is Mediterranean, while further inland it is moderate Mediterranean . In the mountains, winters are frosty and snowy, while summers are hot and dry. To the south winters are milder. Over the centuries many forests have been cut down and replaced with bush and brush. There is evergreen vegetation on the coast. The soils are generally poor, except on the plains where areas with natural grass, fertile soils and warm summers provide an opportunity for tillage. Elsewhere, land cultivation is mostly unsuccessful because of the mountains, hot summers and poor soils, although olives and grapes flourish. Energy resources are scarce. Electricity is mainly produced by hydropower stations. There is a considerable amount of bauxite.[citation needed]

The largest Dalmatian mountains are Dinara, Mosor, Svilaja, Biokovo, Moseć, Veliki Kozjak and Mali Kozjak. The regional geographical unit of historical Dalmatia[clarification needed] - the coastal region between Istria and the Gulf of Kotor - includes the Orjen mountain with the highest peak in Montenegro, 1894 m. In present-day Dalmatia, the highest peak is Dinara (1913 m), which is not a coastal mountain, while the highest coastal Dinaric mountains are on Biokovo (Sv. Jure 1762 m) and Velebit (Vaganski vrh 1758 m),[17] although the Vaganski vrh itself is located in Lika-Senj County.[18]

Independent Dalmatia - Extent of Marcellinus' Control (454-468) and Julius Nepos' Control (468-480).

Dalmatia's name is derived from the name of an Illyrian tribe called the Dalmatae who lived in the area of the eastern Adriatic coast in the 1st millennium BC. It was part of the Illyrian Kingdom between the 4th century BC and the Illyrian Wars (220, 168 BC) when the Roman Republic established its protectorate south of the river Neretva. The name "Dalmatia" was in use probably from the second half of the 2nd century BC and certainly from the first half of the 1st century BC, defining a coastal area of the eastern Adriatic between the Krka and Neretva rivers.[20] It was slowly incorporated into Roman possessions until the Roman province of Illyricum was formally established around 32-27 BC. In 9 AD the Dalmatians raised the last in a series of revolts[21] together with the Pannonians, but it was finally crushed, and in 10 AD, Illyricum was split into two provinces, Pannonia and Dalmatia which spread into larger area inland to cover all of the Dinaric Alps and most of the eastern Adriatic coast.[22]

The historian Theodore Mommsen wrote in his book, The Provinces of the Roman Empire, that all Dalmatia was fully romanized by the 4th century AD. However, analysis of archaeological material from that period has shown that the process of romanization was rather selective. While urban centers, both coastal and inland, were almost completely romanized, the situation in the countryside was completely different. Despite the Illyrians being subject to a strong process of acculturation, they continued to speak their native language, worship their own gods and traditions, and follow their own social-political tribal organization which was adapted to Roman administration and political structure only in some necessities.[23]

The Middle Ages in Dalmatia were a period of intense rivalry among neighboring powers: the waning Byzantine Empire, the Kingdom of Croatia (later in a personal union with Hungary), the Bosnian Kingdom, and the Venetian Republic. Dalmatia at the time consisted of the coastal cities functioning much like city-states, with extensive autonomy, but in mutual conflict and without control of the rural hinterland (the Zagora). Ethnically, Dalmatia started out as a Roman region, with a romance culture that began to develop independently, forming the now-extinct Dalmatian language.

The Slavs, loosely allied with the Avars, permanently settled the region in the first half of the 7th century AD and remained its predominant ethnic group ever since. The Croats soon formed their own realm: the Principality of Dalmatian Croatia ruled by native Princes of Guduscan origin. The meaning of the geographical term "Dalmatia", now shrunk to the cities and their immediate hinterland. These cities and towns remained influential as they were well fortified and maintained their connection with the Byzantine Empire. The two communities were somewhat hostile at first, but as the Croats became Christianized this tension increasingly subsided. A degree of cultural mingling soon took place, in some enclaves stronger, in others weaker, as Slavic influence and culture was more accentuated in Ragusa, Spalatum, and Tragurium. In about 925 AD, Duke Tomislav was crowned, establishing the Kingdom of Croatia, and extending his influence further southwards to Zachlumia. Being an ally of the Byzantine Empire, the King was given the status of Protector of Dalmatia, and became its de facto ruler.

In the High Medieval period, the Byzantine Empire was no longer able to maintain its power consistently in Dalmatia, and was finally rendered impotent so far west by the Fourth Crusade in 1204. The Venetian Republic, on the other hand, was in the ascendant, while the Kingdom of Croatia became increasingly influenced by Hungary to the north, being absorbed into it via personal union in 1102. Thus, these two factions became involved in a struggle in this area, intermittently controlling it as the balance shifted. During the reign of King Emeric, the Dalmatian cities separated from Hungary by a treaty.[25] A consistent period of Hungarian rule in Dalmatia was ended with the Mongol invasion of Hungary in 1241. The Mongols severely impaired the feudal state, so much so that that same year, King Béla IV had to take refuge in Dalmatia, as far south as the Klis fortress. The Mongols attacked the Dalmatian cities for the next few years but eventually withdrew without major success.

In 1389 Tvrtko I, the founder of the Bosnian Kingdom, was able to control the Adriatic littoral between Kotor and Šibenik, and even claimed control over the northern coast up to Rijeka, and his own independent ally, Dubrovnik (Ragusa). This was only temporary, as Hungary and the Venetians continued their struggle over Dalmatia after Tvrtko's death in 1391. By this time, the whole Hungarian and Croatian Kingdom was facing increasing internal difficulties, as a 20-year civil war ensued between the Capetian House of Anjou from the Kingdom of Naples, and King Sigismund of the House of Luxembourg. During the war, the losing contender, Ladislaus of Naples, sold his "rights" on Dalmatia to the Venetian Republic for a mere 100,000 ducats. The much more centralized Republic came to control all of Dalmatia by the year 1420, it was to remain under Venetian rule for 377 years (1420–1797).[26]

From 1420 to 1797 the Republic of Venice controlled most of Dalmatia, calling it Esclavonia in the 15th century[27] with the southern enclave, the Bay of Kotor, being called Albania Veneta. Venetian was the commercial lingua franca in the Mediterranean at that time, and it heavily influenced Dalmatian and to a lesser degree coastal Croatian and Albanian.

The southern city of Ragusa (Dubrovnik) became de facto independent in 1358 through the Treaty of Zadar when Venice relinquished its suzerainty over it to Louis I of Hungary. In 1481, Ragusa switched allegiance to the Ottoman Empire. This gave its tradesmen advantages such as access to the Black Sea, and the Republic of Ragusa was the fiercest competitor to Venice's merchants in the 15th and 16th century.

The Republic of Venice was also one of the powers most hostile to the Ottoman Empire's expansion, and participated in many wars against it. As the Turks took control of the hinterland, many Christians took refuge in the coastal cities of Dalmatia. The border between the Dalmatian hinterland and the Ottoman Bosnia and Herzegovina greatly fluctuated until the Morean War, when the Venetian capture of Knin and Sinj set much of the borderline at its current position.[28]

After the Great Turkish War and the Peace of Passarowitz, more peaceful times made Dalmatia experience a period of certain economic and cultural growth in the 18th century, with the re-establishment of trade and exchange with the hinterland. This period was abruptly interrupted with the fall of the Republic of Venice in 1797. Napoleon's troops stormed the region and ended the independence of the Republic of Ragusa as well, but saving it from occupation by the Russian Empire and Montenegro.

In 1805, Napoleon created his Kingdom of Italy around the Adriatic Sea, annexing to it the former Venetian Dalmatia from Istria to Kotor. In 1808 he annexed to this Italian Kingdom the just conquered Republic of Ragusa. A year later in 1809 he removed the Venetian Dalmatia from his Kingdom of Italy and created the Illyrian Provinces, which were annexed to France, and created his marshal Nicolas SoultDuke of Dalmatia.

Napoleon's rule in Dalmatia was marked with war and high taxation, which caused several rebellions. On the other hand, French rule greatly contributed to Croatian national awakening (the first newspaper in Croatian was published then in Zadar, the Il Regio Dalmata – Kraglski Dalmatin), the legal system and infrastructure were finally modernized to a degree in Dalmatia, and the educational system flourished. French rule brought a lot of improvements in infrastructure; many roads were built or reconstructed. Napoleon himself blamed Marshal Auguste Marmont, the governor of Dalmatia, that too much money was spent. However, in 1813, the Habsburgs once again declared war on France and by 1814 restored control over Dalmatia.

In 1848, the Croatian Assembly (Sabor) published the People's Requests, in which they requested among other things the abolition of serfdom and the unification of Dalmatia and Croatia. The Dubrovnik Municipality was the most outspoken of all the Dalmatian communes in its support for unification with Croatia. A letter was sent from Dubrovnik to Zagreb with pledges to work for this idea. In 1849, Dubrovnik continued to lead the Dalmatian cities in the struggle for unification. A large-scale campaign was launched in the Dubrovnik paper L'Avvenire (The Future) based on a clearly formulated programme: the federal system for the Habsburg territories, the inclusion of Dalmatia into Croatia and the Slavic brotherhood. The president of the council of Kingdom of Dalmatia was the politician Baron Vlaho Getaldić.

In the same year, the first issue of the Dubrovnik almanac appeared, Flower of the National Literature (Dubrovnik, cvijet narodnog književstva), in which Petar Preradović published his noted poem "To Dubrovnik". This and other literary and journalistic texts, which continued to be published, contributed to the awakening of the national consciousness reflected in efforts to introduce the Croatian language into schools and offices, and to promote Croatian books. The Emperor Franz Joseph brought the so-called Imposed Constitution which prohibited the unification of Dalmatia and Croatia and also any further political activity with this end in view. The political struggle of Dubrovnik to be united with Croatia, which was intense throughout 1848 and 1849, did not succeed at that time.

In 1861 was the meeting of the first Dalmatian Assembly, with representatives from Dubrovnik. Representatives of Kotor came to Dubrovnik to join the struggle for unification with Croatia. The citizens of Dubrovnik gave them a festive welcome, flying Croatian flags from the ramparts and exhibiting the slogan: Ragusa with Kotor. The Kotorans elected a delegation to go to Vienna; Dubrovnik nominated Niko Pucić. Niko Pucić went to Vienna to demand not only the unification of Dalmatia with Croatia, but also the unification of all Croatian territories under one common Assembly.

In 1905 a dispute arose in the Austrian Reichsrat over whether Austria should pay for Dalmatia. It has been argued that in the conclusion of the so-called "April Laws" is written "given by Banus Count Keglevich of Buzin", which explained the historical affiliation of Dalmatia to Hungary.[29] Two years later Dalmatia elected representatives to the Austrian Reichsrat.

Dalmatia was a strategic region during World War I that both Italy and Serbia intended to seize from Austria-Hungary. Italy joined the Triple EntenteAllies in 1915 upon agreeing to the London Pact that guaranteed Italy the right to annex a large portion of Dalmatia in exchange for Italy's participation on the Allied side. From 5–6 November 1918, Italian forces were reported to have reached Lissa, Lagosta, Sebenico, and other localities on the Dalmatian coast.[30] By the end of hostilities in November 1918, the Italian military had seized control of the entire portion of Dalmatia that had been guaranteed to Italy by the London Pact and by 17 November had seized Rijeka as well.[31] In 1918, Admiral Enrico Millo declared himself Italy's Governor of Dalmatia.[31] Famous Italian nationalistGabriele d'Annunzio supported the seizure of Dalmatia, and proceeded to Zadar in an Italian warship in December 1918.[32]

In 1922, the territory of the former Kingdom of Dalmatia was divided into two provinces, the District of Split (Splitska oblast), with its capital in Split, and the District of Dubrovnik (Dubrovačka oblast), with its capital in Dubrovnik. In 1929, the Littoral Banovina (Primorska Banovina), a province of the Kingdom of Yugoslavia, was formed. Its capital was Split, and it included most of Dalmatia and parts of present-day Bosnia and Herzegovina. The southern parts of Dalmatia were in Zeta Banovina, from the Gulf of Kotor to Pelješac peninsula including Dubrovnik. In 1939, Littoral Banovina was joined with Sava Banovina (and with smaller parts of other banovinas) to form a new province named the Banovina of Croatia. The same year, the ethnic Croatian areas of the Zeta Banovina from the Gulf of Kotor to Pelješac, including Dubrovnik, were merged with a new Banovina of Croatia.

During World War II, in 1941, Nazi Germany, Fascist Italy, Hungary and Bulgaria occupied Yugoslavia, redrawing their borders to include former parts of the Yugoslavian state. A new Nazi puppet state, the Independent State of Croatia (NDH), was created, and Fascist Italy was given some parts of the Dalmatian coast, notably around Zadar and Split, as well as many of the area's islands. The remaining parts of Dalmatia became part of the NDH. Many Croats moved from the Italian-occupied area and took refuge in the satellite state of Croatia, which became the battleground for a guerrilla war between the Axis and the Yugoslav Partisans. Following the surrender of Italy in 1943, most of Italian-controlled Dalmatia was reverted to Croatian control. Zadar was razed by the Allies during World War II, starting the exodus of its Italian population. After WWII, Dalmatia became part of the People's Republic of Croatia, part of the SFR Yugoslavia (then called the Federative People's Republic of Yugoslavia).

The territory of former Kingdom of Dalmatia was divided between two federal Republics of Yugoslavia and most of the territory went to Croatia, leaving only the Bay of Kotor to Montenegro. When Yugoslavia dissolved in 1991, those borders were retained and remain in force.

During the Croatian war of Independence, most of Dalmatia was a battleground between the Croatian government and local Serb rebels, with much of the region being placed under the control of Serbs. Croatia did regain southern parts of these territories in 1992 but did not regain all of the territory until 1995.